Yiheng DK-8AB Precision Circulating Water Bath

Overview

The Yiheng DK-8AB Precision Circulating Water Bath is a laboratory-grade thermostatic system engineered for stable, uniform thermal control in research, quality control, and educational environments. It operates on the principle of forced convection via an integrated internal circulation pump, ensuring homogeneous temperature distribution across the 22-liter stainless steel bath chamber. Designed specifically for applications requiring precise heating without refrigeration, the unit maintains setpoints from ambient +5°C up to 70°C with a typical stability of ±0.5°C under steady-state conditions. Its triple-bath configuration enables parallel experiments at distinct temperatures—each zone independently regulated by dedicated microprocessor-based PID controllers. This architecture supports reproducible thermal conditioning of samples, calibration standards, or reaction vessels without cross-contamination or thermal interference.

Key Features

• Triple independent stainless steel baths (each with dedicated heating element and sensor) for simultaneous multi-temperature experimentation.
• Digital microprocessor controller with LED display, offering intuitive menu-driven operation, real-time temperature readout, and programmable timer function (up to 99 hours 59 minutes).
• Internal circulation system with adjustable pump speed (optional configuration), enhancing thermal homogeneity and minimizing vertical temperature gradients.
• Over-temperature protection with audible alarm and visual indicator—automatically cuts power when deviation exceeds safety threshold, safeguarding both samples and equipment.
• Corrosion-resistant 304 stainless steel inner chamber and lid, facilitating easy cleaning and long-term durability in aqueous and mild chemical environments.
• Heating-only design optimized for energy efficiency and operational simplicity; no compressor or refrigerant required.
• Compliant with IEC 61010-1 safety standards for electrical equipment used in laboratory settings.

Sample Compatibility & Compliance

The DK-8AB accommodates standard laboratory glassware including beakers, flasks, test tubes, and immersion probes—compatible with water, glycerol-water mixtures, silicone oils, and other non-corrosive heat-transfer media within its operational temperature window. Its construction meets material compatibility requirements per ISO 8573-1 for cleanroom-adjacent use and conforms to GLP-relevant design principles, including traceable temperature logging (when paired with external data acquisition systems). While not intrinsically compliant with FDA 21 CFR Part 11, the optional multi-stage programmable controller supports audit-trail-capable operation when integrated with validated third-party software platforms.

Software & Data Management

The base model features embedded firmware with non-volatile memory for retaining user-defined setpoints and timer configurations after power interruption. The optional multi-stage programmable controller extends functionality with up to 30 programmable segments, enabling ramp-hold profiles, scheduled start/stop cycles, and pump-speed modulation. Data export is supported via RS-232 interface (standard) or USB-to-serial adapter (accessory), allowing integration with LabVIEW, MATLAB, or custom SCADA systems for automated process recording. All temperature logs adhere to ISO/IEC 17025 documentation requirements when used in accredited testing laboratories.

Applications

• Enzyme activity assays and protein denaturation studies requiring tightly controlled incubation temperatures.
• Calibration of thermometers, RTDs, and thermocouples against NIST-traceable reference standards.
• Accelerated stability testing of pharmaceutical formulations per ICH Q1A(R2) guidelines.
• Material testing—including polymer melt index determination and viscosity measurements using capillary viscometers.
• Cell culture pre-warming, reagent equilibration, and solvent bath preparation in molecular biology workflows.
• Educational demonstrations of heat transfer kinetics, phase change behavior, and thermal equilibrium dynamics.

FAQ

Is the DK-8AB suitable for oil bath applications?

Yes—the unit is rated for use with silicone oils and other non-volatile, non-corrosive heat-transfer fluids up to 70°C; ensure fluid viscosity remains compatible with the internal pump’s flow characteristics.
Does it support external temperature probe input for chamber monitoring?

No—the standard configuration uses built-in PT100 sensors; however, optional analog output (0–5 V or 4–20 mA) is available for connection to external dataloggers.
Can the three baths operate at different temperatures simultaneously?

Yes—each bath has independent PID control, allowing concurrent operation at three discrete setpoints within the RT+5°C to 70°C range.
What is the maximum recommended fill level for optimal circulation?

For uniform thermal performance, maintain liquid level between 80% and 95% of total bath volume (i.e., 17.6–20.9 L) to avoid cavitation and ensure full impeller submersion.
Is calibration certificate included with shipment?

A factory calibration report (traceable to national standards) is provided; ISO/IEC 17025-accredited calibration is available as a value-added service upon request.